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In recent years, stream cipher systems have played a big role especially in computer networks. Stream cipher systems depend on pseudo-random (PR) binary key sequences which are mixed with the plaintexts using addition with modulo two to produce the ciphertexts. The PR key sequences are characterized by three properties which defi ne the measure of security for these sequences. These properties are period, complexity and randomness. There are several methods to determine the degree of complexityfatcat:tzwjyarpxffibpqv3dhckcs2ii